Multi-Block PLOT3D

[Simon J. Rees]

I have been visualizing multi-block structured data using vtk. (This type of
data is very common in computational fluid dynamics and related
applications). I am not tied to any particular file format (such as Plot3D)
so the easiest way I have found to do this is to re-write my data to a
unstructured format vtk file. This means using vtkUnstructured.... readers
etc. and I realize I am loosing some efficiency. It also means that points
along inter-block boundaries are being duplicated in the data. In practice
however, this does not seem to be a problem. (I guess I could have multiple
data files with a single block in each but this would mean multple pipeline
branches - not very easy to manage as the number of blocks is variable).

I would therefore welcome something like vtkCompositeStructuredGrid. I don't
have the resources to offer to work on this unfortunately. My plea would be
for a suitable adaption of the generic vtk file format to alow specification
of multiple structured block data in a single file. Don't really know how
difficult that would be? I expect it could be done in a backwards compatible
way.

My $0.02

Simon Rees


----- Original Message -----
From: Will Schroeder <will.schroeder at kitware.com>
To: Sathya Krishnamurthy <skrishna at cscs.ch>; <vtkusers at public.kitware.com>
Sent: Wednesday, April 19, 2000 11:59 AM
Subject: Re: Multi-Block PLOT3D


> This triggered some related ideas about multi-block structured grids.
>
> I think the right way to do this is to create a vtkCompositeStructuredGrid
class (subclass of vtkDataSet).
> The class would internally manage it's structured grids in order to
satisfy the vtkDataSet API. (For
> example GetCell(cellId) requires a set of unique, monotonically increasing
cell id's.)
>
> This is a lot of work, but would be a nice addition. Comments?
>
> Will
>
> At 05:01 PM 4/19/00 +0200, Sathya Krishnamurthy wrote:
> >Hi
> >
> >Has anyone been successful in having a Multi-Part (Block) PLOT3D reader
in
> >VTK ?
> >
> >Thanks a lot
> >
> >Sincerely
> >Sathya
> >
> >------------------------------------------------------------------
> >Sathya Krishnamurthy
> >Research Scientist  , CSCS
> >Galleria 2 , Via Cantonale
> >CH - 6928 , Manno Switzerland
> >Ph: 41-91-6108260 ----- mobile: 41-76-574-0069
>
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